1316 lines
32 KiB
C
1316 lines
32 KiB
C
/*
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* lirc_serial.c
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*
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* lirc_serial - Device driver that records pulse- and pause-lengths
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* (space-lengths) between DDCD event on a serial port.
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*
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* Copyright (C) 1996,97 Ralph Metzler <rjkm@thp.uni-koeln.de>
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* Copyright (C) 1998 Trent Piepho <xyzzy@u.washington.edu>
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* Copyright (C) 1998 Ben Pfaff <blp@gnu.org>
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* Copyright (C) 1999 Christoph Bartelmus <lirc@bartelmus.de>
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* Copyright (C) 2007 Andrei Tanas <andrei@tanas.ca> (suspend/resume support)
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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/*
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* Steve's changes to improve transmission fidelity:
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* - for systems with the rdtsc instruction and the clock counter, a
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* send_pule that times the pulses directly using the counter.
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* This means that the LIRC_SERIAL_TRANSMITTER_LATENCY fudge is
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* not needed. Measurement shows very stable waveform, even where
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* PCI activity slows the access to the UART, which trips up other
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* versions.
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* - For other system, non-integer-microsecond pulse/space lengths,
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* done using fixed point binary. So, much more accurate carrier
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* frequency.
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* - fine tuned transmitter latency, taking advantage of fractional
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* microseconds in previous change
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* - Fixed bug in the way transmitter latency was accounted for by
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* tuning the pulse lengths down - the send_pulse routine ignored
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* this overhead as it timed the overall pulse length - so the
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* pulse frequency was right but overall pulse length was too
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* long. Fixed by accounting for latency on each pulse/space
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* iteration.
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*
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* Steve Davies <steve@daviesfam.org> July 2001
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*/
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/fs.h>
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#include <linux/interrupt.h>
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#include <linux/ioport.h>
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#include <linux/kernel.h>
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#include <linux/serial_reg.h>
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#include <linux/time.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/wait.h>
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#include <linux/mm.h>
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#include <linux/delay.h>
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#include <linux/poll.h>
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#include <linux/platform_device.h>
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#include <asm/system.h>
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#include <linux/io.h>
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#include <linux/irq.h>
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#include <linux/fcntl.h>
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#include <linux/spinlock.h>
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#ifdef CONFIG_LIRC_SERIAL_NSLU2
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#include <asm/hardware.h>
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#endif
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/* From Intel IXP42X Developer's Manual (#252480-005): */
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/* ftp://download.intel.com/design/network/manuals/25248005.pdf */
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#define UART_IE_IXP42X_UUE 0x40 /* IXP42X UART Unit enable */
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#define UART_IE_IXP42X_RTOIE 0x10 /* IXP42X Receiver Data Timeout int.enable */
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#include <media/lirc.h>
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#include <media/lirc_dev.h>
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#define LIRC_DRIVER_NAME "lirc_serial"
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struct lirc_serial {
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int signal_pin;
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int signal_pin_change;
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u8 on;
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u8 off;
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long (*send_pulse)(unsigned long length);
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void (*send_space)(long length);
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int features;
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spinlock_t lock;
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};
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#define LIRC_HOMEBREW 0
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#define LIRC_IRDEO 1
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#define LIRC_IRDEO_REMOTE 2
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#define LIRC_ANIMAX 3
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#define LIRC_IGOR 4
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#define LIRC_NSLU2 5
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/*** module parameters ***/
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static int type;
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static int io;
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static int irq;
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static int iommap;
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static int ioshift;
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static int softcarrier = 1;
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static int share_irq;
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static int debug;
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static int sense = -1; /* -1 = auto, 0 = active high, 1 = active low */
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static int txsense; /* 0 = active high, 1 = active low */
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#define dprintk(fmt, args...) \
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do { \
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if (debug) \
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printk(KERN_DEBUG LIRC_DRIVER_NAME ": " \
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fmt, ## args); \
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} while (0)
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/* forward declarations */
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static long send_pulse_irdeo(unsigned long length);
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static long send_pulse_homebrew(unsigned long length);
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static void send_space_irdeo(long length);
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static void send_space_homebrew(long length);
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static struct lirc_serial hardware[] = {
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[LIRC_HOMEBREW] = {
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.signal_pin = UART_MSR_DCD,
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.signal_pin_change = UART_MSR_DDCD,
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.on = (UART_MCR_RTS | UART_MCR_OUT2 | UART_MCR_DTR),
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.off = (UART_MCR_RTS | UART_MCR_OUT2),
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.send_pulse = send_pulse_homebrew,
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.send_space = send_space_homebrew,
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#ifdef CONFIG_LIRC_SERIAL_TRANSMITTER
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.features = (LIRC_CAN_SET_SEND_DUTY_CYCLE |
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LIRC_CAN_SET_SEND_CARRIER |
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LIRC_CAN_SEND_PULSE | LIRC_CAN_REC_MODE2)
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#else
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.features = LIRC_CAN_REC_MODE2
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#endif
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},
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[LIRC_IRDEO] = {
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.signal_pin = UART_MSR_DSR,
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.signal_pin_change = UART_MSR_DDSR,
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.on = UART_MCR_OUT2,
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.off = (UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2),
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.send_pulse = send_pulse_irdeo,
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.send_space = send_space_irdeo,
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.features = (LIRC_CAN_SET_SEND_DUTY_CYCLE |
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LIRC_CAN_SEND_PULSE | LIRC_CAN_REC_MODE2)
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},
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[LIRC_IRDEO_REMOTE] = {
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.signal_pin = UART_MSR_DSR,
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.signal_pin_change = UART_MSR_DDSR,
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.on = (UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2),
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.off = (UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2),
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.send_pulse = send_pulse_irdeo,
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.send_space = send_space_irdeo,
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.features = (LIRC_CAN_SET_SEND_DUTY_CYCLE |
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LIRC_CAN_SEND_PULSE | LIRC_CAN_REC_MODE2)
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},
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[LIRC_ANIMAX] = {
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.signal_pin = UART_MSR_DCD,
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.signal_pin_change = UART_MSR_DDCD,
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.on = 0,
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.off = (UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2),
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.send_pulse = NULL,
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.send_space = NULL,
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.features = LIRC_CAN_REC_MODE2
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},
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[LIRC_IGOR] = {
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.signal_pin = UART_MSR_DSR,
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.signal_pin_change = UART_MSR_DDSR,
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.on = (UART_MCR_RTS | UART_MCR_OUT2 | UART_MCR_DTR),
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.off = (UART_MCR_RTS | UART_MCR_OUT2),
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.send_pulse = send_pulse_homebrew,
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.send_space = send_space_homebrew,
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#ifdef CONFIG_LIRC_SERIAL_TRANSMITTER
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.features = (LIRC_CAN_SET_SEND_DUTY_CYCLE |
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LIRC_CAN_SET_SEND_CARRIER |
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LIRC_CAN_SEND_PULSE | LIRC_CAN_REC_MODE2)
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#else
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.features = LIRC_CAN_REC_MODE2
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#endif
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},
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#ifdef CONFIG_LIRC_SERIAL_NSLU2
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/*
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* Modified Linksys Network Storage Link USB 2.0 (NSLU2):
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* We receive on CTS of the 2nd serial port (R142,LHS), we
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* transmit with a IR diode between GPIO[1] (green status LED),
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* and ground (Matthias Goebl <matthias.goebl@goebl.net>).
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* See also http://www.nslu2-linux.org for this device
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*/
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[LIRC_NSLU2] = {
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.signal_pin = UART_MSR_CTS,
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.signal_pin_change = UART_MSR_DCTS,
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.on = (UART_MCR_RTS | UART_MCR_OUT2 | UART_MCR_DTR),
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.off = (UART_MCR_RTS | UART_MCR_OUT2),
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.send_pulse = send_pulse_homebrew,
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.send_space = send_space_homebrew,
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#ifdef CONFIG_LIRC_SERIAL_TRANSMITTER
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.features = (LIRC_CAN_SET_SEND_DUTY_CYCLE |
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LIRC_CAN_SET_SEND_CARRIER |
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LIRC_CAN_SEND_PULSE | LIRC_CAN_REC_MODE2)
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#else
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.features = LIRC_CAN_REC_MODE2
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#endif
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},
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#endif
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};
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#define RS_ISR_PASS_LIMIT 256
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/*
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* A long pulse code from a remote might take up to 300 bytes. The
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* daemon should read the bytes as soon as they are generated, so take
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* the number of keys you think you can push before the daemon runs
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* and multiply by 300. The driver will warn you if you overrun this
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* buffer. If you have a slow computer or non-busmastering IDE disks,
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* maybe you will need to increase this.
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*/
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/* This MUST be a power of two! It has to be larger than 1 as well. */
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#define RBUF_LEN 256
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static struct timeval lasttv = {0, 0};
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static struct lirc_buffer rbuf;
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static unsigned int freq = 38000;
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static unsigned int duty_cycle = 50;
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/* Initialized in init_timing_params() */
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static unsigned long period;
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static unsigned long pulse_width;
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static unsigned long space_width;
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#if defined(__i386__)
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/*
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* From:
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* Linux I/O port programming mini-HOWTO
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* Author: Riku Saikkonen <Riku.Saikkonen@hut.fi>
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* v, 28 December 1997
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*
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* [...]
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* Actually, a port I/O instruction on most ports in the 0-0x3ff range
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* takes almost exactly 1 microsecond, so if you're, for example, using
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* the parallel port directly, just do additional inb()s from that port
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* to delay.
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* [...]
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*/
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/* transmitter latency 1.5625us 0x1.90 - this figure arrived at from
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* comment above plus trimming to match actual measured frequency.
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* This will be sensitive to cpu speed, though hopefully most of the 1.5us
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* is spent in the uart access. Still - for reference test machine was a
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* 1.13GHz Athlon system - Steve
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*/
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/*
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* changed from 400 to 450 as this works better on slower machines;
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* faster machines will use the rdtsc code anyway
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*/
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#define LIRC_SERIAL_TRANSMITTER_LATENCY 450
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#else
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/* does anybody have information on other platforms ? */
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/* 256 = 1<<8 */
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#define LIRC_SERIAL_TRANSMITTER_LATENCY 256
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#endif /* __i386__ */
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/*
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* FIXME: should we be using hrtimers instead of this
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* LIRC_SERIAL_TRANSMITTER_LATENCY nonsense?
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*/
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/* fetch serial input packet (1 byte) from register offset */
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static u8 sinp(int offset)
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{
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if (iommap != 0)
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/* the register is memory-mapped */
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offset <<= ioshift;
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return inb(io + offset);
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}
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/* write serial output packet (1 byte) of value to register offset */
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static void soutp(int offset, u8 value)
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{
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if (iommap != 0)
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/* the register is memory-mapped */
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offset <<= ioshift;
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outb(value, io + offset);
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}
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static void on(void)
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{
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#ifdef CONFIG_LIRC_SERIAL_NSLU2
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/*
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* On NSLU2, we put the transmit diode between the output of the green
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* status LED and ground
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*/
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if (type == LIRC_NSLU2) {
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gpio_line_set(NSLU2_LED_GRN, IXP4XX_GPIO_LOW);
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return;
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}
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#endif
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if (txsense)
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soutp(UART_MCR, hardware[type].off);
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else
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soutp(UART_MCR, hardware[type].on);
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}
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static void off(void)
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{
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#ifdef CONFIG_LIRC_SERIAL_NSLU2
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if (type == LIRC_NSLU2) {
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gpio_line_set(NSLU2_LED_GRN, IXP4XX_GPIO_HIGH);
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return;
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}
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#endif
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if (txsense)
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soutp(UART_MCR, hardware[type].on);
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else
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soutp(UART_MCR, hardware[type].off);
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}
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#ifndef MAX_UDELAY_MS
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#define MAX_UDELAY_US 5000
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#else
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#define MAX_UDELAY_US (MAX_UDELAY_MS*1000)
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#endif
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static void safe_udelay(unsigned long usecs)
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{
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while (usecs > MAX_UDELAY_US) {
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udelay(MAX_UDELAY_US);
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usecs -= MAX_UDELAY_US;
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}
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udelay(usecs);
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}
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#ifdef USE_RDTSC
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/*
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* This is an overflow/precision juggle, complicated in that we can't
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* do long long divide in the kernel
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*/
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/*
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* When we use the rdtsc instruction to measure clocks, we keep the
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* pulse and space widths as clock cycles. As this is CPU speed
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* dependent, the widths must be calculated in init_port and ioctl
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* time
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*/
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/* So send_pulse can quickly convert microseconds to clocks */
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static unsigned long conv_us_to_clocks;
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static int init_timing_params(unsigned int new_duty_cycle,
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unsigned int new_freq)
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{
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__u64 loops_per_sec, work;
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duty_cycle = new_duty_cycle;
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freq = new_freq;
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loops_per_sec = __this_cpu_read(cpu.info.loops_per_jiffy);
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loops_per_sec *= HZ;
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/* How many clocks in a microsecond?, avoiding long long divide */
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work = loops_per_sec;
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work *= 4295; /* 4295 = 2^32 / 1e6 */
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conv_us_to_clocks = (work >> 32);
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/*
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* Carrier period in clocks, approach good up to 32GHz clock,
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* gets carrier frequency within 8Hz
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*/
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period = loops_per_sec >> 3;
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period /= (freq >> 3);
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/* Derive pulse and space from the period */
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pulse_width = period * duty_cycle / 100;
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space_width = period - pulse_width;
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dprintk("in init_timing_params, freq=%d, duty_cycle=%d, "
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"clk/jiffy=%ld, pulse=%ld, space=%ld, "
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"conv_us_to_clocks=%ld\n",
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freq, duty_cycle, __this_cpu_read(cpu_info.loops_per_jiffy),
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pulse_width, space_width, conv_us_to_clocks);
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return 0;
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}
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#else /* ! USE_RDTSC */
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static int init_timing_params(unsigned int new_duty_cycle,
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unsigned int new_freq)
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{
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/*
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* period, pulse/space width are kept with 8 binary places -
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* IE multiplied by 256.
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*/
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if (256 * 1000000L / new_freq * new_duty_cycle / 100 <=
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LIRC_SERIAL_TRANSMITTER_LATENCY)
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return -EINVAL;
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if (256 * 1000000L / new_freq * (100 - new_duty_cycle) / 100 <=
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LIRC_SERIAL_TRANSMITTER_LATENCY)
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return -EINVAL;
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duty_cycle = new_duty_cycle;
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freq = new_freq;
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period = 256 * 1000000L / freq;
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pulse_width = period * duty_cycle / 100;
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space_width = period - pulse_width;
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dprintk("in init_timing_params, freq=%d pulse=%ld, "
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"space=%ld\n", freq, pulse_width, space_width);
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return 0;
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}
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#endif /* USE_RDTSC */
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/* return value: space length delta */
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static long send_pulse_irdeo(unsigned long length)
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{
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long rawbits, ret;
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int i;
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unsigned char output;
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unsigned char chunk, shifted;
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/* how many bits have to be sent ? */
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rawbits = length * 1152 / 10000;
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if (duty_cycle > 50)
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chunk = 3;
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else
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chunk = 1;
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for (i = 0, output = 0x7f; rawbits > 0; rawbits -= 3) {
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shifted = chunk << (i * 3);
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shifted >>= 1;
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output &= (~shifted);
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i++;
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if (i == 3) {
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soutp(UART_TX, output);
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while (!(sinp(UART_LSR) & UART_LSR_THRE))
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;
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output = 0x7f;
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i = 0;
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}
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}
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if (i != 0) {
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soutp(UART_TX, output);
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while (!(sinp(UART_LSR) & UART_LSR_TEMT))
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;
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}
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if (i == 0)
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ret = (-rawbits) * 10000 / 1152;
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else
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ret = (3 - i) * 3 * 10000 / 1152 + (-rawbits) * 10000 / 1152;
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return ret;
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}
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#ifdef USE_RDTSC
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/* Version that uses Pentium rdtsc instruction to measure clocks */
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/*
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* This version does sub-microsecond timing using rdtsc instruction,
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* and does away with the fudged LIRC_SERIAL_TRANSMITTER_LATENCY
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* Implicitly i586 architecture... - Steve
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*/
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static long send_pulse_homebrew_softcarrier(unsigned long length)
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{
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int flag;
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unsigned long target, start, now;
|
|
|
|
/* Get going quick as we can */
|
|
rdtscl(start);
|
|
on();
|
|
/* Convert length from microseconds to clocks */
|
|
length *= conv_us_to_clocks;
|
|
/* And loop till time is up - flipping at right intervals */
|
|
now = start;
|
|
target = pulse_width;
|
|
flag = 1;
|
|
/*
|
|
* FIXME: This looks like a hard busy wait, without even an occasional,
|
|
* polite, cpu_relax() call. There's got to be a better way?
|
|
*
|
|
* The i2c code has the result of a lot of bit-banging work, I wonder if
|
|
* there's something there which could be helpful here.
|
|
*/
|
|
while ((now - start) < length) {
|
|
/* Delay till flip time */
|
|
do {
|
|
rdtscl(now);
|
|
} while ((now - start) < target);
|
|
|
|
/* flip */
|
|
if (flag) {
|
|
rdtscl(now);
|
|
off();
|
|
target += space_width;
|
|
} else {
|
|
rdtscl(now); on();
|
|
target += pulse_width;
|
|
}
|
|
flag = !flag;
|
|
}
|
|
rdtscl(now);
|
|
return ((now - start) - length) / conv_us_to_clocks;
|
|
}
|
|
#else /* ! USE_RDTSC */
|
|
/* Version using udelay() */
|
|
|
|
/*
|
|
* here we use fixed point arithmetic, with 8
|
|
* fractional bits. that gets us within 0.1% or so of the right average
|
|
* frequency, albeit with some jitter in pulse length - Steve
|
|
*/
|
|
|
|
/* To match 8 fractional bits used for pulse/space length */
|
|
|
|
static long send_pulse_homebrew_softcarrier(unsigned long length)
|
|
{
|
|
int flag;
|
|
unsigned long actual, target, d;
|
|
length <<= 8;
|
|
|
|
actual = 0; target = 0; flag = 0;
|
|
while (actual < length) {
|
|
if (flag) {
|
|
off();
|
|
target += space_width;
|
|
} else {
|
|
on();
|
|
target += pulse_width;
|
|
}
|
|
d = (target - actual -
|
|
LIRC_SERIAL_TRANSMITTER_LATENCY + 128) >> 8;
|
|
/*
|
|
* Note - we've checked in ioctl that the pulse/space
|
|
* widths are big enough so that d is > 0
|
|
*/
|
|
udelay(d);
|
|
actual += (d << 8) + LIRC_SERIAL_TRANSMITTER_LATENCY;
|
|
flag = !flag;
|
|
}
|
|
return (actual-length) >> 8;
|
|
}
|
|
#endif /* USE_RDTSC */
|
|
|
|
static long send_pulse_homebrew(unsigned long length)
|
|
{
|
|
if (length <= 0)
|
|
return 0;
|
|
|
|
if (softcarrier)
|
|
return send_pulse_homebrew_softcarrier(length);
|
|
else {
|
|
on();
|
|
safe_udelay(length);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static void send_space_irdeo(long length)
|
|
{
|
|
if (length <= 0)
|
|
return;
|
|
|
|
safe_udelay(length);
|
|
}
|
|
|
|
static void send_space_homebrew(long length)
|
|
{
|
|
off();
|
|
if (length <= 0)
|
|
return;
|
|
safe_udelay(length);
|
|
}
|
|
|
|
static void rbwrite(int l)
|
|
{
|
|
if (lirc_buffer_full(&rbuf)) {
|
|
/* no new signals will be accepted */
|
|
dprintk("Buffer overrun\n");
|
|
return;
|
|
}
|
|
lirc_buffer_write(&rbuf, (void *)&l);
|
|
}
|
|
|
|
static void frbwrite(int l)
|
|
{
|
|
/* simple noise filter */
|
|
static int pulse, space;
|
|
static unsigned int ptr;
|
|
|
|
if (ptr > 0 && (l & PULSE_BIT)) {
|
|
pulse += l & PULSE_MASK;
|
|
if (pulse > 250) {
|
|
rbwrite(space);
|
|
rbwrite(pulse | PULSE_BIT);
|
|
ptr = 0;
|
|
pulse = 0;
|
|
}
|
|
return;
|
|
}
|
|
if (!(l & PULSE_BIT)) {
|
|
if (ptr == 0) {
|
|
if (l > 20000) {
|
|
space = l;
|
|
ptr++;
|
|
return;
|
|
}
|
|
} else {
|
|
if (l > 20000) {
|
|
space += pulse;
|
|
if (space > PULSE_MASK)
|
|
space = PULSE_MASK;
|
|
space += l;
|
|
if (space > PULSE_MASK)
|
|
space = PULSE_MASK;
|
|
pulse = 0;
|
|
return;
|
|
}
|
|
rbwrite(space);
|
|
rbwrite(pulse | PULSE_BIT);
|
|
ptr = 0;
|
|
pulse = 0;
|
|
}
|
|
}
|
|
rbwrite(l);
|
|
}
|
|
|
|
static irqreturn_t irq_handler(int i, void *blah)
|
|
{
|
|
struct timeval tv;
|
|
int counter, dcd;
|
|
u8 status;
|
|
long deltv;
|
|
int data;
|
|
static int last_dcd = -1;
|
|
|
|
if ((sinp(UART_IIR) & UART_IIR_NO_INT)) {
|
|
/* not our interrupt */
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
counter = 0;
|
|
do {
|
|
counter++;
|
|
status = sinp(UART_MSR);
|
|
if (counter > RS_ISR_PASS_LIMIT) {
|
|
printk(KERN_WARNING LIRC_DRIVER_NAME ": AIEEEE: "
|
|
"We're caught!\n");
|
|
break;
|
|
}
|
|
if ((status & hardware[type].signal_pin_change)
|
|
&& sense != -1) {
|
|
/* get current time */
|
|
do_gettimeofday(&tv);
|
|
|
|
/* New mode, written by Trent Piepho
|
|
<xyzzy@u.washington.edu>. */
|
|
|
|
/*
|
|
* The old format was not very portable.
|
|
* We now use an int to pass pulses
|
|
* and spaces to user space.
|
|
*
|
|
* If PULSE_BIT is set a pulse has been
|
|
* received, otherwise a space has been
|
|
* received. The driver needs to know if your
|
|
* receiver is active high or active low, or
|
|
* the space/pulse sense could be
|
|
* inverted. The bits denoted by PULSE_MASK are
|
|
* the length in microseconds. Lengths greater
|
|
* than or equal to 16 seconds are clamped to
|
|
* PULSE_MASK. All other bits are unused.
|
|
* This is a much simpler interface for user
|
|
* programs, as well as eliminating "out of
|
|
* phase" errors with space/pulse
|
|
* autodetection.
|
|
*/
|
|
|
|
/* calc time since last interrupt in microseconds */
|
|
dcd = (status & hardware[type].signal_pin) ? 1 : 0;
|
|
|
|
if (dcd == last_dcd) {
|
|
printk(KERN_WARNING LIRC_DRIVER_NAME
|
|
": ignoring spike: %d %d %lx %lx %lx %lx\n",
|
|
dcd, sense,
|
|
tv.tv_sec, lasttv.tv_sec,
|
|
tv.tv_usec, lasttv.tv_usec);
|
|
continue;
|
|
}
|
|
|
|
deltv = tv.tv_sec-lasttv.tv_sec;
|
|
if (tv.tv_sec < lasttv.tv_sec ||
|
|
(tv.tv_sec == lasttv.tv_sec &&
|
|
tv.tv_usec < lasttv.tv_usec)) {
|
|
printk(KERN_WARNING LIRC_DRIVER_NAME
|
|
": AIEEEE: your clock just jumped "
|
|
"backwards\n");
|
|
printk(KERN_WARNING LIRC_DRIVER_NAME
|
|
": %d %d %lx %lx %lx %lx\n",
|
|
dcd, sense,
|
|
tv.tv_sec, lasttv.tv_sec,
|
|
tv.tv_usec, lasttv.tv_usec);
|
|
data = PULSE_MASK;
|
|
} else if (deltv > 15) {
|
|
data = PULSE_MASK; /* really long time */
|
|
if (!(dcd^sense)) {
|
|
/* sanity check */
|
|
printk(KERN_WARNING LIRC_DRIVER_NAME
|
|
": AIEEEE: "
|
|
"%d %d %lx %lx %lx %lx\n",
|
|
dcd, sense,
|
|
tv.tv_sec, lasttv.tv_sec,
|
|
tv.tv_usec, lasttv.tv_usec);
|
|
/*
|
|
* detecting pulse while this
|
|
* MUST be a space!
|
|
*/
|
|
sense = sense ? 0 : 1;
|
|
}
|
|
} else
|
|
data = (int) (deltv*1000000 +
|
|
tv.tv_usec -
|
|
lasttv.tv_usec);
|
|
frbwrite(dcd^sense ? data : (data|PULSE_BIT));
|
|
lasttv = tv;
|
|
last_dcd = dcd;
|
|
wake_up_interruptible(&rbuf.wait_poll);
|
|
}
|
|
} while (!(sinp(UART_IIR) & UART_IIR_NO_INT)); /* still pending ? */
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
|
|
static int hardware_init_port(void)
|
|
{
|
|
u8 scratch, scratch2, scratch3;
|
|
|
|
/*
|
|
* This is a simple port existence test, borrowed from the autoconfig
|
|
* function in drivers/serial/8250.c
|
|
*/
|
|
scratch = sinp(UART_IER);
|
|
soutp(UART_IER, 0);
|
|
#ifdef __i386__
|
|
outb(0xff, 0x080);
|
|
#endif
|
|
scratch2 = sinp(UART_IER) & 0x0f;
|
|
soutp(UART_IER, 0x0f);
|
|
#ifdef __i386__
|
|
outb(0x00, 0x080);
|
|
#endif
|
|
scratch3 = sinp(UART_IER) & 0x0f;
|
|
soutp(UART_IER, scratch);
|
|
if (scratch2 != 0 || scratch3 != 0x0f) {
|
|
/* we fail, there's nothing here */
|
|
printk(KERN_ERR LIRC_DRIVER_NAME ": port existence test "
|
|
"failed, cannot continue\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
|
|
|
|
/* Set DLAB 0. */
|
|
soutp(UART_LCR, sinp(UART_LCR) & (~UART_LCR_DLAB));
|
|
|
|
/* First of all, disable all interrupts */
|
|
soutp(UART_IER, sinp(UART_IER) &
|
|
(~(UART_IER_MSI|UART_IER_RLSI|UART_IER_THRI|UART_IER_RDI)));
|
|
|
|
/* Clear registers. */
|
|
sinp(UART_LSR);
|
|
sinp(UART_RX);
|
|
sinp(UART_IIR);
|
|
sinp(UART_MSR);
|
|
|
|
#ifdef CONFIG_LIRC_SERIAL_NSLU2
|
|
if (type == LIRC_NSLU2) {
|
|
/* Setup NSLU2 UART */
|
|
|
|
/* Enable UART */
|
|
soutp(UART_IER, sinp(UART_IER) | UART_IE_IXP42X_UUE);
|
|
/* Disable Receiver data Time out interrupt */
|
|
soutp(UART_IER, sinp(UART_IER) & ~UART_IE_IXP42X_RTOIE);
|
|
/* set out2 = interrupt unmask; off() doesn't set MCR
|
|
on NSLU2 */
|
|
soutp(UART_MCR, UART_MCR_RTS|UART_MCR_OUT2);
|
|
}
|
|
#endif
|
|
|
|
/* Set line for power source */
|
|
off();
|
|
|
|
/* Clear registers again to be sure. */
|
|
sinp(UART_LSR);
|
|
sinp(UART_RX);
|
|
sinp(UART_IIR);
|
|
sinp(UART_MSR);
|
|
|
|
switch (type) {
|
|
case LIRC_IRDEO:
|
|
case LIRC_IRDEO_REMOTE:
|
|
/* setup port to 7N1 @ 115200 Baud */
|
|
/* 7N1+start = 9 bits at 115200 ~ 3 bits at 38kHz */
|
|
|
|
/* Set DLAB 1. */
|
|
soutp(UART_LCR, sinp(UART_LCR) | UART_LCR_DLAB);
|
|
/* Set divisor to 1 => 115200 Baud */
|
|
soutp(UART_DLM, 0);
|
|
soutp(UART_DLL, 1);
|
|
/* Set DLAB 0 + 7N1 */
|
|
soutp(UART_LCR, UART_LCR_WLEN7);
|
|
/* THR interrupt already disabled at this point */
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int init_port(void)
|
|
{
|
|
int i, nlow, nhigh, result;
|
|
|
|
result = request_irq(irq, irq_handler,
|
|
IRQF_DISABLED | (share_irq ? IRQF_SHARED : 0),
|
|
LIRC_DRIVER_NAME, (void *)&hardware);
|
|
|
|
switch (result) {
|
|
case -EBUSY:
|
|
printk(KERN_ERR LIRC_DRIVER_NAME ": IRQ %d busy\n", irq);
|
|
return -EBUSY;
|
|
case -EINVAL:
|
|
printk(KERN_ERR LIRC_DRIVER_NAME
|
|
": Bad irq number or handler\n");
|
|
return -EINVAL;
|
|
default:
|
|
break;
|
|
};
|
|
|
|
/* Reserve io region. */
|
|
/*
|
|
* Future MMAP-Developers: Attention!
|
|
* For memory mapped I/O you *might* need to use ioremap() first,
|
|
* for the NSLU2 it's done in boot code.
|
|
*/
|
|
if (((iommap != 0)
|
|
&& (request_mem_region(iommap, 8 << ioshift,
|
|
LIRC_DRIVER_NAME) == NULL))
|
|
|| ((iommap == 0)
|
|
&& (request_region(io, 8, LIRC_DRIVER_NAME) == NULL))) {
|
|
printk(KERN_ERR LIRC_DRIVER_NAME
|
|
": port %04x already in use\n", io);
|
|
printk(KERN_WARNING LIRC_DRIVER_NAME
|
|
": use 'setserial /dev/ttySX uart none'\n");
|
|
printk(KERN_WARNING LIRC_DRIVER_NAME
|
|
": or compile the serial port driver as module and\n");
|
|
printk(KERN_WARNING LIRC_DRIVER_NAME
|
|
": make sure this module is loaded first\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
if (hardware_init_port() < 0)
|
|
return -EINVAL;
|
|
|
|
/* Initialize pulse/space widths */
|
|
init_timing_params(duty_cycle, freq);
|
|
|
|
/* If pin is high, then this must be an active low receiver. */
|
|
if (sense == -1) {
|
|
/* wait 1/2 sec for the power supply */
|
|
msleep(500);
|
|
|
|
/*
|
|
* probe 9 times every 0.04s, collect "votes" for
|
|
* active high/low
|
|
*/
|
|
nlow = 0;
|
|
nhigh = 0;
|
|
for (i = 0; i < 9; i++) {
|
|
if (sinp(UART_MSR) & hardware[type].signal_pin)
|
|
nlow++;
|
|
else
|
|
nhigh++;
|
|
msleep(40);
|
|
}
|
|
sense = (nlow >= nhigh ? 1 : 0);
|
|
printk(KERN_INFO LIRC_DRIVER_NAME ": auto-detected active "
|
|
"%s receiver\n", sense ? "low" : "high");
|
|
} else
|
|
printk(KERN_INFO LIRC_DRIVER_NAME ": Manually using active "
|
|
"%s receiver\n", sense ? "low" : "high");
|
|
|
|
dprintk("Interrupt %d, port %04x obtained\n", irq, io);
|
|
return 0;
|
|
}
|
|
|
|
static int set_use_inc(void *data)
|
|
{
|
|
unsigned long flags;
|
|
|
|
/* initialize timestamp */
|
|
do_gettimeofday(&lasttv);
|
|
|
|
spin_lock_irqsave(&hardware[type].lock, flags);
|
|
|
|
/* Set DLAB 0. */
|
|
soutp(UART_LCR, sinp(UART_LCR) & (~UART_LCR_DLAB));
|
|
|
|
soutp(UART_IER, sinp(UART_IER)|UART_IER_MSI);
|
|
|
|
spin_unlock_irqrestore(&hardware[type].lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void set_use_dec(void *data)
|
|
{ unsigned long flags;
|
|
|
|
spin_lock_irqsave(&hardware[type].lock, flags);
|
|
|
|
/* Set DLAB 0. */
|
|
soutp(UART_LCR, sinp(UART_LCR) & (~UART_LCR_DLAB));
|
|
|
|
/* First of all, disable all interrupts */
|
|
soutp(UART_IER, sinp(UART_IER) &
|
|
(~(UART_IER_MSI|UART_IER_RLSI|UART_IER_THRI|UART_IER_RDI)));
|
|
spin_unlock_irqrestore(&hardware[type].lock, flags);
|
|
}
|
|
|
|
static ssize_t lirc_write(struct file *file, const char *buf,
|
|
size_t n, loff_t *ppos)
|
|
{
|
|
int i, count;
|
|
unsigned long flags;
|
|
long delta = 0;
|
|
int *wbuf;
|
|
|
|
if (!(hardware[type].features & LIRC_CAN_SEND_PULSE))
|
|
return -EBADF;
|
|
|
|
count = n / sizeof(int);
|
|
if (n % sizeof(int) || count % 2 == 0)
|
|
return -EINVAL;
|
|
wbuf = memdup_user(buf, n);
|
|
if (IS_ERR(wbuf))
|
|
return PTR_ERR(wbuf);
|
|
spin_lock_irqsave(&hardware[type].lock, flags);
|
|
if (type == LIRC_IRDEO) {
|
|
/* DTR, RTS down */
|
|
on();
|
|
}
|
|
for (i = 0; i < count; i++) {
|
|
if (i%2)
|
|
hardware[type].send_space(wbuf[i] - delta);
|
|
else
|
|
delta = hardware[type].send_pulse(wbuf[i]);
|
|
}
|
|
off();
|
|
spin_unlock_irqrestore(&hardware[type].lock, flags);
|
|
kfree(wbuf);
|
|
return n;
|
|
}
|
|
|
|
static long lirc_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
|
|
{
|
|
int result;
|
|
__u32 value;
|
|
|
|
switch (cmd) {
|
|
case LIRC_GET_SEND_MODE:
|
|
if (!(hardware[type].features&LIRC_CAN_SEND_MASK))
|
|
return -ENOIOCTLCMD;
|
|
|
|
result = put_user(LIRC_SEND2MODE
|
|
(hardware[type].features&LIRC_CAN_SEND_MASK),
|
|
(__u32 *) arg);
|
|
if (result)
|
|
return result;
|
|
break;
|
|
|
|
case LIRC_SET_SEND_MODE:
|
|
if (!(hardware[type].features&LIRC_CAN_SEND_MASK))
|
|
return -ENOIOCTLCMD;
|
|
|
|
result = get_user(value, (__u32 *) arg);
|
|
if (result)
|
|
return result;
|
|
/* only LIRC_MODE_PULSE supported */
|
|
if (value != LIRC_MODE_PULSE)
|
|
return -ENOSYS;
|
|
break;
|
|
|
|
case LIRC_GET_LENGTH:
|
|
return -ENOSYS;
|
|
break;
|
|
|
|
case LIRC_SET_SEND_DUTY_CYCLE:
|
|
dprintk("SET_SEND_DUTY_CYCLE\n");
|
|
if (!(hardware[type].features&LIRC_CAN_SET_SEND_DUTY_CYCLE))
|
|
return -ENOIOCTLCMD;
|
|
|
|
result = get_user(value, (__u32 *) arg);
|
|
if (result)
|
|
return result;
|
|
if (value <= 0 || value > 100)
|
|
return -EINVAL;
|
|
return init_timing_params(value, freq);
|
|
break;
|
|
|
|
case LIRC_SET_SEND_CARRIER:
|
|
dprintk("SET_SEND_CARRIER\n");
|
|
if (!(hardware[type].features&LIRC_CAN_SET_SEND_CARRIER))
|
|
return -ENOIOCTLCMD;
|
|
|
|
result = get_user(value, (__u32 *) arg);
|
|
if (result)
|
|
return result;
|
|
if (value > 500000 || value < 20000)
|
|
return -EINVAL;
|
|
return init_timing_params(duty_cycle, value);
|
|
break;
|
|
|
|
default:
|
|
return lirc_dev_fop_ioctl(filep, cmd, arg);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations lirc_fops = {
|
|
.owner = THIS_MODULE,
|
|
.write = lirc_write,
|
|
.unlocked_ioctl = lirc_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = lirc_ioctl,
|
|
#endif
|
|
.read = lirc_dev_fop_read,
|
|
.poll = lirc_dev_fop_poll,
|
|
.open = lirc_dev_fop_open,
|
|
.release = lirc_dev_fop_close,
|
|
.llseek = no_llseek,
|
|
};
|
|
|
|
static struct lirc_driver driver = {
|
|
.name = LIRC_DRIVER_NAME,
|
|
.minor = -1,
|
|
.code_length = 1,
|
|
.sample_rate = 0,
|
|
.data = NULL,
|
|
.add_to_buf = NULL,
|
|
.rbuf = &rbuf,
|
|
.set_use_inc = set_use_inc,
|
|
.set_use_dec = set_use_dec,
|
|
.fops = &lirc_fops,
|
|
.dev = NULL,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static struct platform_device *lirc_serial_dev;
|
|
|
|
static int __devinit lirc_serial_probe(struct platform_device *dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int __devexit lirc_serial_remove(struct platform_device *dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int lirc_serial_suspend(struct platform_device *dev,
|
|
pm_message_t state)
|
|
{
|
|
/* Set DLAB 0. */
|
|
soutp(UART_LCR, sinp(UART_LCR) & (~UART_LCR_DLAB));
|
|
|
|
/* Disable all interrupts */
|
|
soutp(UART_IER, sinp(UART_IER) &
|
|
(~(UART_IER_MSI|UART_IER_RLSI|UART_IER_THRI|UART_IER_RDI)));
|
|
|
|
/* Clear registers. */
|
|
sinp(UART_LSR);
|
|
sinp(UART_RX);
|
|
sinp(UART_IIR);
|
|
sinp(UART_MSR);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* twisty maze... need a forward-declaration here... */
|
|
static void lirc_serial_exit(void);
|
|
|
|
static int lirc_serial_resume(struct platform_device *dev)
|
|
{
|
|
unsigned long flags;
|
|
|
|
if (hardware_init_port() < 0) {
|
|
lirc_serial_exit();
|
|
return -EINVAL;
|
|
}
|
|
|
|
spin_lock_irqsave(&hardware[type].lock, flags);
|
|
/* Enable Interrupt */
|
|
do_gettimeofday(&lasttv);
|
|
soutp(UART_IER, sinp(UART_IER)|UART_IER_MSI);
|
|
off();
|
|
|
|
lirc_buffer_clear(&rbuf);
|
|
|
|
spin_unlock_irqrestore(&hardware[type].lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver lirc_serial_driver = {
|
|
.probe = lirc_serial_probe,
|
|
.remove = __devexit_p(lirc_serial_remove),
|
|
.suspend = lirc_serial_suspend,
|
|
.resume = lirc_serial_resume,
|
|
.driver = {
|
|
.name = "lirc_serial",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static int __init lirc_serial_init(void)
|
|
{
|
|
int result;
|
|
|
|
/* Init read buffer. */
|
|
result = lirc_buffer_init(&rbuf, sizeof(int), RBUF_LEN);
|
|
if (result < 0)
|
|
return -ENOMEM;
|
|
|
|
result = platform_driver_register(&lirc_serial_driver);
|
|
if (result) {
|
|
printk("lirc register returned %d\n", result);
|
|
goto exit_buffer_free;
|
|
}
|
|
|
|
lirc_serial_dev = platform_device_alloc("lirc_serial", 0);
|
|
if (!lirc_serial_dev) {
|
|
result = -ENOMEM;
|
|
goto exit_driver_unregister;
|
|
}
|
|
|
|
result = platform_device_add(lirc_serial_dev);
|
|
if (result)
|
|
goto exit_device_put;
|
|
|
|
return 0;
|
|
|
|
exit_device_put:
|
|
platform_device_put(lirc_serial_dev);
|
|
exit_driver_unregister:
|
|
platform_driver_unregister(&lirc_serial_driver);
|
|
exit_buffer_free:
|
|
lirc_buffer_free(&rbuf);
|
|
return result;
|
|
}
|
|
|
|
static void lirc_serial_exit(void)
|
|
{
|
|
platform_device_unregister(lirc_serial_dev);
|
|
platform_driver_unregister(&lirc_serial_driver);
|
|
lirc_buffer_free(&rbuf);
|
|
}
|
|
|
|
static int __init lirc_serial_init_module(void)
|
|
{
|
|
int result;
|
|
|
|
result = lirc_serial_init();
|
|
if (result)
|
|
return result;
|
|
|
|
switch (type) {
|
|
case LIRC_HOMEBREW:
|
|
case LIRC_IRDEO:
|
|
case LIRC_IRDEO_REMOTE:
|
|
case LIRC_ANIMAX:
|
|
case LIRC_IGOR:
|
|
/* if nothing specified, use ttyS0/com1 and irq 4 */
|
|
io = io ? io : 0x3f8;
|
|
irq = irq ? irq : 4;
|
|
break;
|
|
#ifdef CONFIG_LIRC_SERIAL_NSLU2
|
|
case LIRC_NSLU2:
|
|
io = io ? io : IRQ_IXP4XX_UART2;
|
|
irq = irq ? irq : (IXP4XX_UART2_BASE_VIRT + REG_OFFSET);
|
|
iommap = iommap ? iommap : IXP4XX_UART2_BASE_PHYS;
|
|
ioshift = ioshift ? ioshift : 2;
|
|
break;
|
|
#endif
|
|
default:
|
|
result = -EINVAL;
|
|
goto exit_serial_exit;
|
|
}
|
|
if (!softcarrier) {
|
|
switch (type) {
|
|
case LIRC_HOMEBREW:
|
|
case LIRC_IGOR:
|
|
#ifdef CONFIG_LIRC_SERIAL_NSLU2
|
|
case LIRC_NSLU2:
|
|
#endif
|
|
hardware[type].features &=
|
|
~(LIRC_CAN_SET_SEND_DUTY_CYCLE|
|
|
LIRC_CAN_SET_SEND_CARRIER);
|
|
break;
|
|
}
|
|
}
|
|
|
|
result = init_port();
|
|
if (result < 0)
|
|
goto exit_serial_exit;
|
|
driver.features = hardware[type].features;
|
|
driver.dev = &lirc_serial_dev->dev;
|
|
driver.minor = lirc_register_driver(&driver);
|
|
if (driver.minor < 0) {
|
|
printk(KERN_ERR LIRC_DRIVER_NAME
|
|
": register_chrdev failed!\n");
|
|
result = -EIO;
|
|
goto exit_release;
|
|
}
|
|
return 0;
|
|
exit_release:
|
|
release_region(io, 8);
|
|
exit_serial_exit:
|
|
lirc_serial_exit();
|
|
return result;
|
|
}
|
|
|
|
static void __exit lirc_serial_exit_module(void)
|
|
{
|
|
lirc_serial_exit();
|
|
|
|
free_irq(irq, (void *)&hardware);
|
|
|
|
if (iommap != 0)
|
|
release_mem_region(iommap, 8 << ioshift);
|
|
else
|
|
release_region(io, 8);
|
|
lirc_unregister_driver(driver.minor);
|
|
dprintk("cleaned up module\n");
|
|
}
|
|
|
|
|
|
module_init(lirc_serial_init_module);
|
|
module_exit(lirc_serial_exit_module);
|
|
|
|
MODULE_DESCRIPTION("Infra-red receiver driver for serial ports.");
|
|
MODULE_AUTHOR("Ralph Metzler, Trent Piepho, Ben Pfaff, "
|
|
"Christoph Bartelmus, Andrei Tanas");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_param(type, int, S_IRUGO);
|
|
MODULE_PARM_DESC(type, "Hardware type (0 = home-brew, 1 = IRdeo,"
|
|
" 2 = IRdeo Remote, 3 = AnimaX, 4 = IgorPlug,"
|
|
" 5 = NSLU2 RX:CTS2/TX:GreenLED)");
|
|
|
|
module_param(io, int, S_IRUGO);
|
|
MODULE_PARM_DESC(io, "I/O address base (0x3f8 or 0x2f8)");
|
|
|
|
/* some architectures (e.g. intel xscale) have memory mapped registers */
|
|
module_param(iommap, bool, S_IRUGO);
|
|
MODULE_PARM_DESC(iommap, "physical base for memory mapped I/O"
|
|
" (0 = no memory mapped io)");
|
|
|
|
/*
|
|
* some architectures (e.g. intel xscale) align the 8bit serial registers
|
|
* on 32bit word boundaries.
|
|
* See linux-kernel/serial/8250.c serial_in()/out()
|
|
*/
|
|
module_param(ioshift, int, S_IRUGO);
|
|
MODULE_PARM_DESC(ioshift, "shift I/O register offset (0 = no shift)");
|
|
|
|
module_param(irq, int, S_IRUGO);
|
|
MODULE_PARM_DESC(irq, "Interrupt (4 or 3)");
|
|
|
|
module_param(share_irq, bool, S_IRUGO);
|
|
MODULE_PARM_DESC(share_irq, "Share interrupts (0 = off, 1 = on)");
|
|
|
|
module_param(sense, bool, S_IRUGO);
|
|
MODULE_PARM_DESC(sense, "Override autodetection of IR receiver circuit"
|
|
" (0 = active high, 1 = active low )");
|
|
|
|
#ifdef CONFIG_LIRC_SERIAL_TRANSMITTER
|
|
module_param(txsense, bool, S_IRUGO);
|
|
MODULE_PARM_DESC(txsense, "Sense of transmitter circuit"
|
|
" (0 = active high, 1 = active low )");
|
|
#endif
|
|
|
|
module_param(softcarrier, bool, S_IRUGO);
|
|
MODULE_PARM_DESC(softcarrier, "Software carrier (0 = off, 1 = on, default on)");
|
|
|
|
module_param(debug, bool, S_IRUGO | S_IWUSR);
|
|
MODULE_PARM_DESC(debug, "Enable debugging messages");
|